playing 6 string songs on 7 is a huge pain, especially on chord or strum heavy songs
Even if you use a windmill strumming approach, the only way that this could be a problem is if you are less conscious of the seventh string than the sixth string.
The first thing I did when I bought a seven string guitar was figure out which bass notes sounded good with which chords (for example, playing D major as 3 x 0 0 2 3 2, G/B as 0 3 2 0 0 3 3, A/C# as 2 0 0 2 2 2 x, etc.)